Depends what size it is, is it a whole piece rolled stringed and scored if so, rub score fat with oil and sea salt put in high oven say 200 220 degrees for about 10 to 15 minutes till the crackling starts to bubble and crisp even more depending on weight, then turn down to low say 160 for 45minutes or more as again on size, p.s , place meat on a rack if you can so the juices run out, i put a wee drop of water at the bottom of the tin for someone reason it keeps the meat moist, if you have a fan oven remember the cooking times will be different!